Temperature-dependent effect of modulation in graphene-supported metamaterials
Temperature-dependent effect of modulation in graphene-supported metamaterials
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DOI：
10.1088/1367-2630/ac5dfa
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发表时间：
2022-04-01
影响因子：
3.3
通讯作者：
Nevirkovets，Ivan P.
中科院分区：
文献类型：
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作者：
Morozov，Yevhenii M.;Lapchuk，Anatoliy S.;Nevirkovets，Ivan P.
我们报告了石墨烯支撑的超材料中的一种新的温度依赖性调制效应。在理论分析中观察到的效果的模型石墨烯支撑的电光调制器具有二氧化硅（SiO2）或二氧化铪（HfO2）作为缓冲介质层。两种材料的比较分析表明，它们提供了近似相同的透射和反射调制深度的最大值。然而，在HfO 2缓冲层的情况下，需要石墨烯的较低化学势来实现最大值。此外，理论计算表明，在HfO 2层的情况下，需要施加较低的栅极电压（高达6.4倍），以实现相同的石墨烯化学势。石墨烯层被发现具有高吸收（由于额外的共振激发）的化学势的一些值，这种效果是非常依赖于温度。所发现的调制效应被证明进一步增加了传输调制深度的简单模型结构高达2.7倍（从18.4%到50.1%），而反射调制深度，这种增强等于2.2倍（从24.4%到52.8%）。这种新颖的调制效应可以很容易地被广泛地应用于各种元器件，这将为相关研究领域的发展提供快速的助推器。
We report on a novel effect of temperature-dependent modulation in graphene-supported metamaterials. The effect was observed during the theoretical analysis of a model graphene-supported electro-optical modulator having silicon dioxide (SiO 2) or hafnium dioxide (HfO 2) as a buffer dielectric layer. Comparative analysis of the two materials showed that they provide approximately the same maximum values for transmission and reflection modulation depths. However, in the case of a HfO 2 buffer layer, a lower chemical potential of the graphene is required to achieve the maximum value. Moreover, theoretical calculations revealed that a lower gate voltage (up to 6.4 times) is required to be applied in the case of a HfO 2 layer to achieve the same graphene chemical potential. The graphene layer was found to possesses high absorption (due to the additional resonance excitation) for some values of chemical potential and this effect is extremely temperature dependent. The discovered modulation effect was demonstrated to further increase the transmission modulation depth for the simple model structure up to 2.7 times (from 18.4% to 50.1%), while for the reflection modulation depth, this enhancement was equal to 2.2 times (from 24.4% to 52.8%). The novel modulation effect could easily be adopted and applied over a wide range of metadevices which would serve as a quick booster for the development of related research areas.